'A + B'means'A is the daughter of B';
'A x B' means 'A is the son of B';
'A - B' means 'A is the wife of B.
If 'P X Q' means 'P is the daughter of Q';
'P + Q' means'P is the father of Q';
'P + Q' means 'P is the mother of Q' and
'P - Q' means 'P is the brother of Q',
then in the expression A ÷ B + C - E x F how is A related to F?